Marking-gage.



N. HELWIG.

MARKING GAGE.

APPLIGATIONPILBD MAR.13,1912.

Patented sept. 17, 1912;

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MARKING-GAGE.

Specification of Letters Patent.

Patented Sept. 17,1912.

Application led March 13, 1912. Serial No. 683,621.

To all whom it may concern;

Be it known that I, NICHOLAS IInLwIG, a citizen of the United States, residing at Middletown, in the county ofV Butler and State of Ohio, have invented certain new and useful Improvements in Marking-Gages, of which the following is a specification.

This invention relates to that class of gages generally known as marking gages, the same comprising a stock on which is adjustably mounted a head, said stock having a scribing po-int at one of its ends.

It is the object of the invention to provide an implement of this kind which is capable of fine adjustment, and which is recording so that the head may be set back to any previous measure.

The invention also has for its object to provide a structure which enables the implement to be converted into a thickness gage, a drill and wire gage, and a depth gage.

With these objects in View, the invention consists in a novel constructiony and arrangement of parts to be hereinafter described and claimed.

In the accompanying drawing forming a part of this specification, Figure 1 is an elevation of the implement partly in section; Fig. 2 is an end view thereof, and Figs. 3 and 4 are elevations partly in section showing two modifications. Y

Referring specically to the drawing, 5 denotes the stock of the gage, the same comprising a rod which is screw-threaded and carries on one of its ends scribing points 6. @n the stock is mounted a head 7 having a threaded bore so that it may be screwed on the stock and adjusted lengthwise thereon by a rotary movement. The stock has a longitu dinal recess 8 extending throughout its entire length. One of the walls 9 of the recess ext-ends radially with respect to the stock1 and the other wall l() extends perpendicularly with respect to the wall 9. The wall 10 has inch graduations 11, and the wall 9 corresponds to the Zero or index line of the gage. The head 7 is circular and has radial graduations 12 on one of its faces. As shown, the graduations divide the face into eight equidistant parts. Thus, if the stock has 16 threads to the inch, it will be evident that if the head is rotatedia distance equal to one of the spaces on the graduated part of the head, the head is caused to travel on the stock a distance equal to 1/8th of 1/16th of an inch; or 1/128th of an inch. Hence the head can be set very accurately for fine work. The stock may be threaded twenty threads to the inch, and the head given ten graduations subdivided into five parts, so that the gage may read 200ths and 1/1000tl1s of an inch., In the latter case the inch grad nations 11 will be divided into four equidistant parts, and these are each divided into 5 equidist-ant parts, so that a decimal of an inch can be set without a rule or scale.

The head 7 has a hub extension 13 on one side, against which extension abuts a washer la mounted loosely on the stock 5, and against the washer abuts a lock nut 15 screwed on the stock, the washer being thus held between the hub and the lock-nut.

The implement herein described is simple in construction, it can be easily adjusted, and it is accurate and eft'ectually serves the purpose for which it is designed. The graduations 12 extend to the bore of the head and may therefore be brought into registry with the wall 9 thus facilitating the adjustment of the head.

Fig. 3 of the drawing shows the implement converted into a thickness gage or a drill and wire gage. As shown the scribing points 6 are removed and a bar 16 is substituted therefor. The implement can also be converted into a depth gage as shown in Fig. 4, by removing t-he bar 1G and attaching a bar 17 to the head 7, said bar being screwed to the hub portion 13 of the head.

I claim:

In a gage, a stock having a longitudinal recess, one of the walls of which extends radially with respect to the stock, and the other wall having graduations, and a head adjustably mounted on the stock, and having radial graduations, said head being rotatable to bring its graduations into registry with the first-mentioned wall.

In testimony whereof I atx my signature in presence of two witnesses.

NICHOLAS HELWIG.

Witnesses:

L. C. HEFFNER, B. C. LANGDON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, ID. G. f 

